I only have room for the rear springs. So I will only be using 1 spring
on each side. The reason for the heaver springs is the fact that the
Jag independent rear pivots close to the center of the car similar to
a front A Frame that uses heaver springs. I was looking for someone
that has run a similar set up. 1923sst is using two 175# springs on each side on a 1950 # car so one 300# spring might be about right .